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ListItemFocusablesFarApartTest.javaAPI DocAndroid 5.1 API4500Thu Mar 12 22:22:12 GMT 2015android.widget.listview.arrowscroll

ListItemFocusablesFarApartTest

public class ListItemFocusablesFarApartTest extends android.test.ActivityInstrumentationTestCase

Fields Summary
private android.widget.ListView
mListView
private int
mListTop
private int
mListBottom
Constructors Summary
public ListItemFocusablesFarApartTest()

        super("com.android.frameworks.coretests", ListItemFocusablesFarApart.class);
Methods Summary
public intgetBottomOfChildOfItem(int listIndex, int index)

        ViewGroup listItem = (ViewGroup) mListView.getChildAt(listIndex);
        View child = listItem.getChildAt(index);
        return child.getBottom() + listItem.getTop();
public android.view.ViewgetChildOfItem(int listIndex, int index)
Get the child of a list item.

param
listIndex The index of the currently visible items
param
index The index of the child.

        return ((ViewGroup) mListView.getChildAt(listIndex)).getChildAt(index);
public intgetTopOfChildOfItem(int listIndex, int index)

        ViewGroup listItem = (ViewGroup) mListView.getChildAt(listIndex);
        View child = listItem.getChildAt(index);
        return child.getTop() + listItem.getTop();
protected voidsetUp()

        super.setUp();
        mListView = getActivity().getListView();
        mListTop = mListView.getListPaddingTop();
        mListBottom = mListView.getHeight() - mListView.getListPaddingBottom();
public voidtestPanWhenNextFocusableTooFarDown()


        int expectedTop = mListView.getChildAt(0).getTop();

        final Button topButton = (Button) getChildOfItem(0, 0);

        int counter = 0;
        while(getTopOfChildOfItem(0, 2) > mListBottom) {
            // just to make sure we never end up with an infinite loop
            if (counter > 5) fail("couldn't reach next button within " + counter + " downs");

            if (getBottomOfChildOfItem(0, 0) < mListTop) {
                assertFalse("after " + counter + " downs, top button not visible, should not have focus",
                        topButton.isFocused());
                assertFalse("after " + counter + " downs, neither top button nor botom button visible, nothng within first list " +
                        "item should have focus", mListView.getChildAt(0).hasFocus());
            } else {
                assertTrue("after " + counter + " downs, top button still visible, should have focus",
                        topButton.isFocused());
            }

            assertEquals("after " + counter + " downs, " +
                    "should have panned by max scroll amount",
                    expectedTop, mListView.getChildAt(0).getTop());

            sendKeys(KeyEvent.KEYCODE_DPAD_DOWN);
            expectedTop -= mListView.getMaxScrollAmount();
            counter++;
        }

        // at this point, the second button is visible on screen.
        // it should have focus
        assertTrue("second button should have focus",
                getChildOfItem(0, 2).isFocused());
public voidtestPreconditions()

        assertNotNull(mListView);
        assertEquals("should only be one visible list item",
                1, mListView.getChildCount());
        int topOfFirstButton = getTopOfChildOfItem(0, 0);
        int topOfSecondButton = getTopOfChildOfItem(0, 2);
        assertTrue("second button should be more than max scroll away from first",
                topOfSecondButton - topOfFirstButton > mListView.getMaxScrollAmount());